1. Justin got his start as a Mouseketeer on "The Mickey Mouse Club."

2. Saying 'bye bye bye' to his Disney days, he became the youngest member of *N Sync. Fans were Justin Timberlake crazy over those curly blonde locks!

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3. *N Sync was dominating the radio in the late '90s, and became one of the most popular boybands - Justin being one of the heartthrobs of the group. Here he is at the Billboard Awards in 1998.

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4. In 1999, Justin made his acting debut in "Model Behavior" and played Jason Sharpe, a male model.

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5. He briefly dated Emma Bunton aka Baby Spice at one point in time.

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6. In 2000 Justin hit the road with the rest of his *N Sync buddies on their world tour.

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7. He attended the 2000 Oscar Awards.

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8. And at one point in 2000 Justin thought braids would be a good look.

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9. Justin started dating Britney Spears in 1999, and in 2001, famously rocked these matching denim ensembles together on the red carpet.

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10. Timberlake got the idea for *NSYNC's "Gone" when Britney Spears went to the hair salon and didn't return for hours.

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11. At the MTV Europe Music Awards in 2003, Justin won several awards including, "Best Male Artist," "Best Pop Artist," and "Best Album," for "Justified."

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12. In 2003, Justin began dating Cameron Diaz after they met at the Kid's Choice Awards.

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13. He was nominated for "Favorite Male Singer" at the Kids Choice Awards in 2003 & 2004.

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14. Justin Timberlake showed off his b-ball skills during *NSYNC's Challenge for the Children VI. Here he is with Usher!

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15. By 2005, his solo career was flourishing, and had collaborated with artists like Black Eyed Peas and Snoop Dogg. However, that same year he also developed a throat condition and underwent surgery to remove nodules.

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16. In 2006, Justin appeared in the movie Edison Force, playing a journalist.

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17. Love was in their air for Justin in 2007. He started dating, who would become his future wife, Jessica Biel.

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18. At the Kid's Choice Awards, in 2007, Justin won "Favorite Male Singer."

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19. In January 2007, Justin hit the road on his "Future Sex/Love Show" world tour.